from flask import abort, jsonify
from flask import current_app
from flask import g
from flask import request
from flask import session

from info import constants, db
from info.models import News, User, Comment, CommentLike
from info.modules.news import news_blu
from flask import render_template

from info.utils.common import user_login_data
from info.utils.response_code import RET


@news_blu.route('/followed_user', methods=['POST'])
@user_login_data
def followed_user():
    # 关注或取消关注
    # 取到自己的登录信息
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='未登录')

    # 取参数
    user_id = request.json.get('user_id')
    action = request.json.get('action')

    # 判断参数
    if not all([user_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    if action not in (['follow', 'unfollow']):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 取到要被关注的用户
    try:
        other = User.query.get(user_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询失败')

    if not other:
        return jsonify(errno=RET.NODATA, errmsg='未找到数据')

    # 根据要执行的操作去修改对应的数据
    if action == 'follow':

        if other not in user.followers:
            # 当前用户的关注列表添加一个值
            user.collection_news.append(other)
        else:
            return jsonify(errno=RET.DATAERR, errmsg='当前用户已被关注')
    else:
        # 取消关注
        if other not in user.followers:
            user.followers(other)
        else:
            return jsonify(errno=RET.DATAERR, errmsg='当前用户未被关注')

    return jsonify(errno=RET.OK, errmsg='操作成功')

@news_blu.route('/comment_like', methods=['POST'])
@user_login_data
def comment_like():
    """
    评论点赞
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    # 接收参数
    comment_id = request.json.get('comment_id')
    # news_id = request.json.get('news_id') 不用news_id
    action = request.json.get('action')

    # 判断参数
    if not all([comment_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    if action not in (['add', 'remove']):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        comment_id = int(comment_id)
        # news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # 3. 获取到要被点赞的评论模型
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')

    if not comment:
        return jsonify(errno=RET.NODATA, errmsg='评论不存在')

    if action == 'add':
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id, CommentLike.comment_id == comment.id).first()

        if not comment_like_model:
            # 点赞评论
            comment_like_model = CommentLike()
            comment_like_model.user_id = user.id
            comment_like_model.comment_id = comment.id
            db.session.add(comment_like_model)
            comment.like_count += 1

    else:
        # 取消点赞                              filter()	把过滤器添加到原查询上，返回一个新查询                                    first()	返回查询的第一个结果，如果未查到，返回None
        comment_like_model = CommentLike.query.filter(CommentLike.user_id == user.id,CommentLike.comment_id == comment.id).first()

        if comment_like_model:
            db.session.delete(comment_like_model)
            comment.like_count -= 1

    try:
        db.session.commit()
    except Exception as e:
        db.session.rollback()
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据库操作错误')

    return jsonify(errno=RET.OK, errmsg='操作成功')


@news_blu.route('/news_comment', methods=['POST'])
@user_login_data
def comment_news():
    """
    评论新闻或回复新闻下面指定的评论
    :return:
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    # 接收参数
    news_id = request.json.get('news_id')
    comment_content = request.json.get('comment')
    parent_id = request.json.get('parent_id')

    # 判断参数
    if not all([news_id, comment_content]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    try:
        news_id = int(news_id)
        if parent_id:
            parent_id = int(parent_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    # 查询新闻
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询错误')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未找到新闻')

    # 初始化一个评论模型，并赋值
    comment = Comment()
    comment.user_id = user.id
    comment.news_id = news_id
    comment.content = comment_content
    if parent_id:
        comment.parent_id = parent_id

    # 添加到数据库
    # 为什么要自己去commit（）？因为return的时候要用到comment的id
    try:
        db.session.add(comment)
        db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()

    return jsonify(errno=RET.OK, errmsg='ok', data=comment.to_dict())


@news_blu.route('/news_collect', methods=['POST'])
@user_login_data
def collect_news():
    """
    收藏新闻
    1接受参数
    2判断参数
    3查询新闻，并判断新闻是否存在
    """
    user = g.user
    if not user:
        return jsonify(errno=RET.SESSIONERR, errmsg='用户未登录')
    # 接收参数
    news_id = request.json.get('news_id')
    action = request.json.get('action')
    # 判断参数
    if not all([news_id, action]):
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')

    if action not in ["collect", "cancel_collect"]:
        return jsonify(errno=RET.PARAMERR, errmsg="参数错误")

    try:
        news_id = int(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.PARAMERR, errmsg='参数错误')
    # c查询新闻是否存在
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR, errmsg='数据查询失败')

    if not news:
        return jsonify(errno=RET.NODATA, errmsg='未查询到新闻数据')

    # 收藏以及取消收藏
    if action == 'cancel_collect':
        # 取消收藏
        if news in user.collection_news:
            user.collection_news.remove(news)
    else:
        # 收藏
        if news not in user.collection_news:
            # 添加到用户的新闻收藏列表
            user.collection_news.append(news)

    # db.session.commit()
    return jsonify(errno=RET.OK, errmsg='操作成功')


@news_blu.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    """
        新闻详情
    """
    # 查询用户登录信息 在common中
    user = g.user

    # 右侧新闻排行逻辑
    news_list = []
    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(constants.CLICK_RANK_MAX_NEWS)
    except Exception as e:
        current_app.logger.error(e)
    # 定义一个空的字典列表
    news_dict_li = []
    # 遍历对象列表 将对象列表的字典添加到字典列表中
    for news in news_list:
        news_dict_li.append(news.to_basic_dict())
    # 查询新闻数据
    news = None

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)

    if not news:
        #
        abort(404)
    # 更新新闻的点击次数
    news.clicks += 1

    is_collected = False

    if user:
        # 判断用户是否收藏当前新闻，如果收藏
        # collection_news 后面可以不要all，因为aqlalchemy会在使用的时候去自动加载
        if news in user.collection_news:
            is_collected = True

    comments = []
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)

    comment_like_ids = []
    if g.user:
        try:
            # 需求：查询当前用户在当前新闻里面都点赞了那些评论
            # 查询出当前新闻的所有评论
            comment_ids = [comment.id for comment in comments]
            # 查询当前评论中哪些评论被当前用户所点赞
            comment_likes = CommentLike.query.filter(CommentLike.comment_id.in_(comment_ids),
                                                     CommentLike.user_id == g.user.id).all()
            # 取到所有被点赞的评论id第二部查询出来是一个
            comment_like_ids = [comment_like.comment_id for comment_like in comment_likes]
        except Exception as e:
            current_app.logger.error(e)

    comment_dict_li = []
    for comment in comments:
        comment_dict = comment.to_dict()
        #         代表没有被点赞
        comment_dict['is_like'] = False
        #     判断当前遍历的评论是否被当前登录的用户所点赞
        if comment.id in comment_like_ids:
            comment_dict['is_like'] = True
        comment_dict_li.append(comment_dict)

    is_followed = False
    # if当前新闻作者， 并且 当前登录用户已关注过这个用户
    if news.user and user:

        if news.user in user.followers:
            is_followed = True



    data = {
        'user': user.to_dict() if user else  None,
        'news_dict_li': news_dict_li,
        'news': news.to_dict(),
        'is_collected': is_collected,
        'is_followed': is_followed,
        'comments': comment_dict_li
    }

    return render_template('news/detail.html', data=data)


